VapourDiffusionDeVries.cpp

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#include "VapourDiffusionDeVries.h"
 
#include <algorithm>
#include <cmath>
 
#include "MaterialLib/MPL/Medium.h"
#include "MaterialLib/MPL/VariableType.h"
#include "MaterialLib/PhysicalConstant.h"
 
namespace MaterialPropertyLib
{
PropertyDataType VapourDiffusionDeVries::value(
    const VariableArray& variable_array,
    const ParameterLib::SpatialPosition& /*pos*/, const double /*t*/,
    const double /*dt*/) const
{
    const double T = variable_array.temperature;
    const double p_g = variable_array.gas_phase_pressure;
 
    return base_diffusion_coefficient_ * std::pow(T, exponent_) / p_g;
}
 
PropertyDataType VapourDiffusionDeVries::dValue(
    VariableArray const& variable_array, Variable const variable,
    ParameterLib::SpatialPosition const& /*pos*/, double const /*t*/,
    double const /*dt*/) const
{
    const double T = variable_array.temperature;
    const double p_g = variable_array.gas_phase_pressure;
 
    if (variable == Variable::temperature)
    {
        return exponent_ * base_diffusion_coefficient_ *
               std::pow(T, exponent_ - 1.0) / p_g;
    }
    if (variable == Variable::gas_phase_pressure)
    {
        return -base_diffusion_coefficient_ * std::pow(T, exponent_) /
               (p_g * p_g);
    }
    if (variable == Variable::liquid_saturation)
    {
        return 0.0;
    }
 
    OGS_FATAL(
        "VapourDiffusionDeVries::dValue is implemented for derivatives with "
        "respect to temperature or saturation only.");
}
 
}  // namespace MaterialPropertyLib